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point of periapsis has 1 distinct synonym spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is point of apoapsis.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
(astronomy) the point in an orbit closest to the body being orbited
Synonyms, antonyms and the broader and narrower relations for point of periapsis come from Princeton University’s WordNet. Full sources and licences.